Was I supposed to know what this product does before reading this page? I got halfway down where they start to talk about the sensors but then goes off into "T

Was I supposed to know what this product does before reading this page? I got halfway down where they start to talk about the sensors but then goes off into "The multiple sensors inside the ring form an 18-path multi-wavelength photoplethysmography (PPG) subsystem to provide highly accurate, continuous data throughout the day and night." What does this thing do and how does that improve my health/life? Nvm I don't care at this point. I must not be the target demographic to wonder such things.